The orage calendar allows to show a dynamic icon in the panel's system tray. However, this icon is not updated as it should. When I suspend my computer on 2012-04-12 and turn it on the next day, the symbol (icon) is not updated, i.e. it shows the date from yesterday.
I forgot to mention, I'm using version 4.8.2 on an OpenSuse 12.1 system.
This is bug 7939. Fixed in 4.8.3. No other workaround than upgrade Orage (or downgrade Gtk+). *** This bug has been marked as a duplicate of bug 7939 ***